United arab omen sudi arabia and yemen
Answer: C It shows the meaning of the symbols used on the map
Explanation:The key of a map is usually used for if the map is complicated like with symbols like triangles that usually represent mountains.
These are the 6 insurgent strategies:
1. Urban
2. Military focused
3. Protracted popular war
4. Identity focused
5. Conspiratorial
6. Composite and coalition
The best answer to your questions seems to be #1: Urban insurgency.
The researchers kept their identities secret because, if they had revealed that their purpouse was to conduct an experiment on the behaviours of the people in the bar, it might have triggered that some people changed their usual attitudes because they know that their 'figures' will be kept in a record.
Maybe some people will drink less as they feel embarrased if some other person is testing how many beers they end. Others, might want to prove themselves 'strong' and drink much more than usual. People change their behaviour sometimes when they are aware that they are watched. This is called the observer effect.
Security. These camera installations are usually referenced as security cameras. I don't think there is a different term for them.